You should look into Overseerr/Jellyseerr, it provides a simple frontend or web app for Sonarr/Radarr. There’s also Reiverr that would probably be the most convenient as it allows you to download and watch from a single ui but I don’t know if it’s still actively developed and it’s only available as a webapp

Alternatively, if you want to stream directly you could try CloudStream which work over http or Stremio for streaming torrent tho I wouldn’t use it without a debrid account